;( function( window ){
  var width = window.innerWidth;
  var height = window.innerHeight;

  var canvas = document.getElementById('background');
  canvas.height = height;
  canvas.width = width;

  var pen =  canvas.getContext('2d');
  
  pen.fillStyle = '#6295bc';

  for( var pos_x = 10; pos_x < width; pos_x = pos_x + 10 ){
    pen.fillRect( pos_x, 0, 1, height );
  }
  for( var pos_y = 10; pos_y < height; pos_y = pos_y + 10 ){
    pen.fillRect( 0,pos_y, width, 1 );
  }

} )( window );